package com.itheima.reggie.service.impl;/**
 * @author zwx
 * @date 2023/11/24 16:17
 */

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.model.entity.*;
import com.itheima.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.PrimitiveIterator;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * @author zwx
 * @date 2023/11/24 16:17
 */
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;
    /**
     * 用户下单
     * @param orders
     * @return
     */
    @Override
    @Transactional //操作多个数据库
    public void submit(Orders orders) {
        //1 获得当前用户id
        Long userId = BaseContext.getCurrentId();

        //2 查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, userId);

        List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);

        if (shoppingCarts == null || shoppingCarts.size() == 0){
            throw new CustomException("该用户购物车为空,不能下单");
        }

        //查用户表，地址表来获得order中需要的相应的数据
        //查用户信息
        User user = userService.getById(userId);

        //查地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);

        if (addressBook == null){
            throw new CustomException("用户地址信息有误,不能下单");
        }

        
        
        //3 向订单表插入数据，一条数据
        //用mybatis-plus来获得一个id赋给orderId
        long orderId = IdWorker.getId(); //订单号

        //原子操作 保证在高并发 多线程的情况下 也能正常计算。
        AtomicInteger amount = new AtomicInteger();

        //遍历购物车数据，获得订单明细，同时获得总金额amout
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //每次累加 multiply是乘法
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        orders.setId(orderId);
        orders.setNumber(String.valueOf(orderId));
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get())); //amout 代表总金额
        orders.setUserId(userId);
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee()); //收货人
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
          + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
          + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
          +(addressBook.getDetail() == null ? "" : addressBook.getDetail())
        );
        this.save(orders);
        //4 向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(wrapper);
    }
}
